Alon, Noga, Simi Haber, and Michael Krivelevich. “The Number of $f$-Matchings in Almost Every Tree Is a Zero Residue”. The Electronic Journal of Combinatorics 18, no. 1 (February 14, 2011): P30. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p30.